Improving the printing Plate durability is a key link to reduce raw material consumption, reduce product production costs, shorten production cycle, and improve economic efficiency. In practice, the following methods can be used to improve the printing durability of the printing plate. 1. Strictly put the printing raw materials into the warehouse. Especially to ensure the purchase of high-quality paper and high-quality PS version. For example, 52g / m2 ~ 60g / m2 paper for printed books and periodicals, if the purchasers are eager to buy cheap paper from informal paper manufacturers, the whiteness, uniformity, smoothness, smoothness, surface tension, sizing degree None of the technical indicators can meet the requirements of printing. The surface of the paper is rough, the paper is gray, and there are many fine sand particles. This easily wears out the photosensitive resin film of the PS plate and reduces the printing durability of the plate. Therefore, to improve the durability of offset printing plates, we must first start from the material purchase channel. Unqualified raw and auxiliary materials will not enter the factory or enter the warehouse. At present, there are many brands in the printing materials market, and it is difficult to distinguish between good and bad. When printing companies purchase materials, they should compare the three to ensure quality and purchase high-quality printing materials. 2. Master the correct PS exposure time. Pay special attention to the amount of exposure, and do not overexpose it, so as not to affect the durability of the printing plate. In general, the four-color color separation film requires that 3% of the small dots are not lost, and 98% of the large dots are not pasted; the patterns, lines, and text are clear, and the small graphics and text are not lost. Strokes, etc. 3. The developer concentration of the PS version should be strictly controlled. When formulating the developer, strictly follow the manufacturer's instructions. The developer or developer powder, sodium hydroxide, and water are accurately measured by the measuring instrument. Do not use experience to formulate or dilute the developer. If the exposure is excessive during the printing process, the concentration of the alkaline solution in the developer of the PS plate is too high or the water temperature is too high, which will directly reduce the print durability of the PS plate. 4. Improve the printing durability of the printing plate by baking the PS plate. At present, many printing manufacturers use the roasting method to print long-lived, high-volume books, newspapers and other products to improve the printing resistance. Bake version in the oven. ①Be sure to clean the dirt and dirty spots on the blank part of the PS version with the repair paste before baking, otherwise it will be difficult to remove the dirty spots after the baking version. ②The towel used for wiping the baking solution is not clean, or the fibers on the towel fall off and are easily stained on the PS version. ③The baking temperature is 200 ～ 220 ℃, and the baking time is generally about 10-15 minutes. It should not be too long. At the same time, the baking time should be determined according to the temperature resistance of the photosensitive resin film of the PS plate. . If the PS photoresist film baked is light brown or brownish red, like the ripe plum color, it means that the baking version is appropriate; if the baking time is too long and the temperature is too high, the PS photoresist film will be baked Paste, or make the base soft. 5. Before printing, check whether the density of the film is appropriate. The blackness of the text, lines and patterns on the sulfuric acid paper should be full, there is no shortage of pen strokes, and the blackness of large characters and wider lines should not be output again. Baking on the electric stove can increase the blackening effect. When baking, it is necessary to prevent the wrinkling of sulfuric acid paper, which affects the inaccurate absorption of the printing plate. When printing large volumes of books, trademarks, packaging and decoration products, whether it is film or sulfuric acid paper, the strokes and lines of the text should be as thick as possible, and they will be resistant to printing accordingly. Density and blackness can not meet the requirements, can not be accommodated, rework and redo, in order to ensure the print resistance of the PS version. 6. The pressure of the water roller on the printing plate should not be too large. When debugging the pressure between the two water rollers and the printing plate, it is better not to use a good printing plate that is formally printed. You can use the old PS plate to debug, so as not to damage the printing plate. At the same time, the thickness of the liner paper in the plate cylinder should be appropriate. The pressure of the water rubber roller on the printing plate is too large, and the graphic wear of the printing plate will also increase, and the printing durability will decrease. 7. When installing the plate, check whether the backing paper on the back of the printing plate has wrinkles, folds, paper scraps and small pieces of paper. If there are such conditions, the printing plate should be removed and the backing paper should be sorted and leveled. 8. When printing plates and repairing the plates after the machine, the residual repair paste is accidentally applied to the photosensitive resin film in the graphic part of the PS version, which plays a role of thinning the film and will also affect the PS printing durability. rate. In addition, the surface of the plate is dirty after the edition, and the plate is often wiped with a cloth dampened with a powder to remove the dirt. However, don't use too much force when wiping the plate with wetting powder, and the time of the wiping test should not be too long, otherwise the photosensitive resin film of the printing plate will not be durable after being wiped thin. 9. Use less pressure when printing. After the printing plate is installed on the plate cylinder, the pressure between the plate cylinder and the rubber cylinder should not be too large. The thickness of the PS version plus the lining paper should not exceed 0.65mm, and the thickness of the rubber cloth plus the lining should not exceed 3.25 ～ 3.40mm (Measured with a micrometer). The plate should be compacted and compacted to prevent relative slippage during the operation of the offset press. In addition, accurately adjust and control the pressure between the ink roller, water roller and plate cylinder of the offset press to avoid direct wear of the plate surface. 10. Strictly control the water-ink balance during the printing process. Pay attention to control the thickness of the ink layer to avoid spreading the ink to the blank part of the printing plate. If the ink is too thick, the tiny particles of colorant, binder, and rubber in the ink will increase the friction of the printing plate, and it will also accelerate the wear of the printing plate. Maintain the normal water supply, and use the minimum amount of water to wet the plate surface on the premise that the blank part of the printing plate is not sticky, so as to reduce paper deformation, ink emulsification, inaccurate overprinting, and ink color dilution. If there is too much water on the plate surface, it will be combined with the weak acid water bucket liquid (used to clean the oil), which will also corrode the printing plate. Maintain the balance of water and ink, and at the same time, it can avoid the dirty, flowered and dropped versions caused by improper ink and wash. 11. Prevent oxidation of the printing plate surface. Be sure to apply gum arabic when the offset press is stopped halfway or during lunch and lunch, so as not to expose the printing plate to the air for a long time, which will lead to oxidation of the printing plate and reduce the printing durability of the printing plate. 12. Prevent abrasion of sundries and plates. Also pay attention not to allow double sheets, multiple sheets and other debris to crush the printing plate during paper conveyance.
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